Various, Encyclopaedia Britannica, 11th Edition…
“ At any rate he was ready to leave Florence when the chance was offered him of fixed service at the court of Ludovico Sforza (il Moro) at Milan. Soon after that prince had firmly established his power as nominal guardian and protector of his nephew Gian Galeazzo but really as usurping ruler of the state, he revived a project previously mooted for the erection of an equestrian monument in honour of the founder of his house’s greatness, Francesco Sforza, and consulted Lorenzo dei Medici on the choice of an artist. ”
